2.4 Metre

2.4 Metre
Development
Class symbol
International 2.4mR
Design	Development class
Boat
Crew	1
Draft	1 m (3 ft 3.370 in) (Mark III)
Hull
Hull weight	260 kg (570 lb)
LOA	4.16 m (13 ft 8 in) (Mark III)
Beam	0.805 m (2 ft 7.7 in)
Rig
Mast Length	4.65 m (15.3 ft)
Sails
Upwind Sail Area	7.5 m² (81 sq ft) (Mark III)
Misc
RYA PN	1250^[1]
Paralympics class

The International 2.4mR is a one-person keelboat. The class is a development class governed by the 2.4mR rule. The rule is controlled by World Sailing (ISAF) since it is one of few classes designated as an International class. The class rule is closely related to the 12mR rule that was used in the America's Cup and the shape often resembles the larger sister.

While there is a small but active group of amateur designer/builders around the world, around 90% of boats are the commercially produced Norlin Mark III designed by yacht designer Peter Norlin of Sweden. Recently, new designs have come into production, such as the Stradivari III and the Proton.

The boat is primarily used for racing and the class holds highly competitive national events in many countries. World and European championships (only when the World Championship is not in Europe) are attracting around 100 boats every year. In some countries it features mainly as a class for sailors with a disability.

The 2.4mR is ideal for adapted sailing since the sailor does not move in the boat, and everything is adjustable from right in front of the sailor. Both hand-steering and foot-steering are possible. The boat's ability in integrated sailing has been proven on the result lists of several World Championships. In 2002 and 2005 there were handicapped World Champions. The boat is sailed without a spinnaker, but with a whisker-pole for the jib.

History

After the 1980 America's Cup, people in the Newport, RI area started sailing boats called Mini-12s named for the 12-Metre yachts used in the America's Cup. As the class developed, word of it spread to Sweden, home of yacht designer Peter Norlin. Norlin tweaked the design, and along with other naval architects he created the 2.4 meter yacht class. Although the 2.4mR is a construction class, Peter Norlin is in practice the totally dominating designer, and the class is therefore often mistaken as a one design class. In addition to all the sailing aspects of the boat, Norlin has worked the design to incorporate features for the physically disabled to use the boat.

One-design

In recent years an attempts have been made to develop a one design class based on the Norlin III. This is primarily because of the need for competition within the paralympics for racing to be about the sailor and not a technical development race. This led to the introduction of (Appendix K to the Class rules) and now a group is working on a set of stand alone One-design rules. This is still at the early stages but it is likely a new one design class is formed alongside the development class.

Rating formula

As an open class rather than a one-design, all boat designs must meet the following formula.^[2]

$R={\dfrac {L+2d-F+{\sqrt {S}}}{2.37}}$

Where (all measurements in mm)

L = the "corrected" length of the hull (see rule D.6.3)
d = the midship girth difference (see rule D.6.4)
F = the average freeboard height (see rule D.6.5)
S = the total rated area of the mainsail and jib combined.

Events

World Championships

Year	Gold	Silver	Bronze
1993 Kokkola	Patrik Forsgren (SWE)	Peter Norlin (SWE)	Ralf Casen (FIN)
1994 Rutland Water	Bo Hedensjö (SWE)	Carl-Gustaf Fresk (SWE)
1995 Aahus	Carl-Gustaf Fresk (SWE)	Marko Dahlberg (FIN)
1996 Cannes	Peter Norlin (SWE)	Bo Hedensjö (SWE)	Imma Björndahl (FIN)
1997	Marko Dahlberg (FIN)	Peter Norlin (SWE)	Patrik Forsgren (SWE)
1998 Tampere	Rikard Bjurström (FIN)
1999	Tom Björndahl (FIN)	Marko Dahlberg (FIN)	Peter Norlin (SWE)
2000 Melbourne	Stellan Berlin (SWE)	Rikard Bjurström (FIN)	Peter Norlin (SWE)
2001 Tønsberg	Heiko Kroeger (GER)	Stellan Berlin (SWE)	Peter Norlin (SWE)
2002 Miami	Stellan Berlin (SWE)	Hans Meyers (USA)	Tom Brown (USA)
2003	Marko Dahlberg (FIN)	Damien Seguin (FRA)	Stellan Berlin (SWE)
2004	Stellan Berlin (SWE)	Ulf Arvidsson (SWE)
2005	Nick Scandone (USA)	Stellan Berlin (SWE)	Helena Lucas (GBR)
2006 Helsinki	Stellan Berlin (SWE)	Thierry Schmitter (NED)	Harri Malm (FIN)
2007 Kolding	Lennart Heselius (SWE)	Stellan Berlin (SWE)	Ulf Arvidsson (SWE)
2008 Gran Canaria	Stellan Berlin (SWE)	Damien Seguin (FRA)	Hans Asklund (SWE)
2009 Fort Myers	John Ruf (USA)	Carl Horrocks (USA)	Paul Tingley (CAN)
2010 Hoorn	Paul Tingley (CAN)	Stellan Berlin (SWE)	Hans Asklund (SWE)
2011 Ålesund	Stellan Berlin (SWE)	Marko Dahlberg (FIN)	Rikard Bjurström (FIN)
2012 Porto San Giorgio	Peter Andersson (SWE)	Stellan Berlin (SWE)	Megan Pascoe (GBR)
2013 Poole	Stellan Berlin (SWE)	Helena Lucas (GBR)	Megan Pascoe (GBR)
2014 Toronto	Stellan Berlin (SWE)	Bjørnar Erikstad (NOR)	Helena Lucas (GBR)
2015 Rauma	Stellan Berlin (SWE)	Bjørnar Erikstad (NOR)	Heiko Kröger (GER)
2016 Hobart	Megan Pascoe (GBR)	Matt Bugg (AUS)	Paul Francis (NZL)

Disabled World Championships

The 2.4 metre has been used a number of times as equipment for the One-Person Technical Disabled displine which holds an annual World Championships.

Paralympics

Since 2000 the 2.4 Metre has been the official single-crew class boat for sailing at the Summer Paralympics although it has been used in a more one design form utilising the Norlin Mk3 design.

References

↑ "Portsmouth Number List 2012". Royal Yachting Association. Retrieved 31 July 2012.
↑ Marie. "International 2.4 mR Class Rules (2006)" (PDF). Inter24metre.org. Archived from the original (PDF) on 2009-08-21. Retrieved 2009-08-16.

External links

Wikimedia Commons has media related to 2.4 Metre (keelboat).

Sailing at the Summer Paralympics

	1996 (demonstration) 2000 2004 2008 2012 2016

List of medalists

Classes of World Sailing

Current Olympic classes	470 49er 49er FX Finn Laser Laser Radial RS:X Nacra 17

ISAF centreboard classes	29er 420 505 B14 Byte Cadet Contender Enterprise Europe Fireball Flying Dutchman Flying Junior GP14 Int. 14 Laser 2 Laser 4.7 Lightning Mirror Moth Musto Performance Skiff O'pen BIC OK Dinghy Optimist RS Feva RS Tera RS100 RS500 Snipe Splash Sunfish Tasar Topper Vaurien Zoom 8

ISAF keelboat classes	12 mR 2.4 mR 5.5 m 6 mR 8 mR Dragon Etchells Flying 15 Hansa 2.3 Hansa 303 Hansa Liberty H-boat J/22 J/24 J/70 J/80 Melges 20 Melges 24 Melges 32 Micro Platu 25 RC44 SB20 Shark 24 Soling Sonar Star Tempest Yngling

ISAF yacht classes	Class40 Farr 30 (Mumm 30) Farr 40 IMOCA 60 J/111 International Maxi Association Soto 40 Swan 45 Swan 60 TP 52 X-35 X-41

ISAF multihull classes	A-Class Dart 18 Formula 16 Formula 18 Hobie 14 Hobie 16 Hobie Dragoon Hobie Tiger Hobie Wildcat Nacra Infusion SL 16 Topcat K1 Tornado Viper F16

ISAF windsurfer classes	Formula Experience Formula Windsurfing Funboard Kona Mistral Raceboard RS:One Speed Windsurfing Techno 293

ISAF kiteboarding classes	International Kiteboarding Association

International Radio Sailing Association classes	10 rater A Class Marblehead One Metre

Former ISAF classes	11:Metre One Design 29erXX Aloha Buzz C-Class Division I Division II Division III Elliott 6m Farr 45 Farr Maxi One Design Hobie 17 Hobie 18 IOD ISO Laser Vago Lechner A-390 Mistral Junior Mumm 36 Nacra F18 Open 50 ORMA 60 Sydney 40 Ultimate 20 Windglider X-99

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